Step 2: Operating Principle

The magnets not only spin around the copper pipe they also spin around their own axles. This results because the visible magnets axle of polarity is on an 90 degree angle in respect to the hidden magnets axle polarity.

It doesn't matter whether it's north or south pole that is facing the copper. Only the axle of polarity is what matters

If you want to use as much as six spinning magnets. I recommend to use a larger diameter than 45 mm. It got too crowded - the cube magnets magnetic fields interfered with each other making it more difficult than it should have been.